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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Top End Speed
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<blockquote data-quote="Chris Launders" data-source="post: 50579" data-attributes="member: 2010"><p>I have a "standardish" twin ex Chris Williams, 2 front heads, big ports (about 34mm) 32mm mk1 concentrics and mk3 cams also a Norvin with front/back heads 33mm ports (the rear one did break through into the rocker tunnel) 34mm mikuni's and mk2 cams, both on 8:1 pistons, both have straight through absorbtion type silencers, there is a big difference in the way they run given that the major difference is the cams.</p><p>The normal twin has steady even acceleration and really pleasant to ride, the Norvin is completely different,won't tickover as steady, pulls ok up to 3000 rpm then takes a BIG step in power, acceleration and noise, then another one about 4.500 rpm. This means that with the Norvin you are forever having to keep an eye on the rev counter and gears and really is harder and noisier to use normally and there are too many cameras etc to use it as it wants.</p></blockquote><p></p>
[QUOTE="Chris Launders, post: 50579, member: 2010"] I have a "standardish" twin ex Chris Williams, 2 front heads, big ports (about 34mm) 32mm mk1 concentrics and mk3 cams also a Norvin with front/back heads 33mm ports (the rear one did break through into the rocker tunnel) 34mm mikuni's and mk2 cams, both on 8:1 pistons, both have straight through absorbtion type silencers, there is a big difference in the way they run given that the major difference is the cams. The normal twin has steady even acceleration and really pleasant to ride, the Norvin is completely different,won't tickover as steady, pulls ok up to 3000 rpm then takes a BIG step in power, acceleration and noise, then another one about 4.500 rpm. This means that with the Norvin you are forever having to keep an eye on the rev counter and gears and really is harder and noisier to use normally and there are too many cameras etc to use it as it wants. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Top End Speed
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